var p_zero : number = + 0;
var n_zero : number = - 0;
if (1.0 / p_zero === 1.0 / n_zero) {
    console.log ('#1: var p_zero = +0; var n_zero = -0; 1.0/p_zero === 1.0/n_zero');
} else {
    console.log ('#1: var p_zero = +0; var n_zero = -0; 1.0/p_zero != 1.0/n_zero');
}
const a : number = 10;
const p : number = 20;
var s : number = p * Math.asin (1 / a) / (2 * Math.PI);
console.log (s);
